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https://nikitushkinandrey.wordpress.com/2012/07/20/%d0%bc%d0%be%d0%b9-%d1%80%d0%b5%d1%86%d0%b5%d0%bf%d1%82-%d0%bf%d0%be-%d0%b4%d0%b5%d1%82%d0%b5%d0%ba%d1%82%d0%b8%d1%80%d0%be%d0%b2%d0%b0%d0%bd%d0%b8%d1%8e-%d0%b8-%d0%b1%d0%bb%d0%be%d0%ba%d0%b8%d1%80/
Мой рецепт по детектированию и блокированию аномального сканирования средствами iptables в Linux